Readiness Coefficient Research Articles

Improvement directions of maintenance system of multiple unit

Purpose. Efficiency of function multiple units park (MUP) as a complex system considerably depends on the modes and conditions of its operation, which is defined as the state of their eigenstate and state of the system content. The purpose is the decision scientifically - a technical problem of system of the content of maintenance operation and repair of a rolling stock. Methodology. Article is devoted to a question of the maintenance operation and repair of a rolling stock of Ukraine. On the basis of theoretical probe, the situation which has developed on maintenance operation and repair of MVPS is analysed. The comparative analysis of a railway, motor and air transportation is provided. On the basis of the analysis and comparison by authors it is offered transition from scheduled preventive to system of service of railway transport to service on an actual state. Findings. According to given theoretical comparison of the put perspective in different types of transport it is possible to note that experience and features of operation rolling stock in allied industries is the base for revision and improvement of system of the maintenance rolling stock, including at various stages of its operation. Originality. This article provides the comparative theoretical analysis, concerning contents and repair system between railway, automobile and by air. Practical value. Introduction new approaches of the maintenance operation and rolling stocks repair will allow carrying out gradual transition from maintenance operation and repairing existing scheduled preventive system in repair system «on an actual state». Thus it is possible maximum cutting-down of number of sudden refusals in operation, providing high coefficient of operational readiness of a rolling stock (to 0.95). A comparative analysis of the maintenance system and repair is the basis of the transition feasibility.

Calculation in the NGN Networks of Indexes of Reliability of Tracts of Transmission of Packet Information

The article describes the main elements that make up the transport network NGN. Shows the relevance of research of reliability of the NGN network, as well as the need of numerical calculation of complex indexes of reliability of tracts of transmission of packet information is given. On the developed imitating model of the NGN network indexes of reliability of tracts of transmission of packet information are calculated when using mechanisms of reservation, and also at their absence. Numerical calculation of the main indexes of reliability (failure rate λ, average time of restoration of communications of Тв, average time of a time between failures То, Кг the coefficient of availability, probability P(t) of no-failure operation in the range of t, coefficient of operational readiness Rг) the NGN network equipment (router, switch) for the main period of operation is given. By the received results conclusions are makes.

ANALYSIS OF MILITARY MOTOR VEHICLES OPERATION PROCESSES

An analysis and assessment of specific problems of military motor vehicles operation have been made, in particular:types of operating methods;→vehicles operation in NATO;→quality, reliability, and structure of vehicles in the Polish Armed Forces;→organisation and implementation of operation processes;→competence level of operational personnel.In addition, general issues related to vehicles use have been formulated, including the impact of vehicles reliability on combat readiness of a military unit and factors affecting the vehicles technical readiness coefficient. An assessment has been made of the effectiveness of the vehicles operation system.

An introduction to the assessment of reliability of the heat supply systems

The considering of the issue of heat supply system reliability requires taking into consideration their complexity and the extent of realization. Two approaches to reliability assessment for heat supply systems are possible: a simple global approach and universal system approach. The global approach is based on analysis of information related to system operation as a whole. The system approach induces system decomposition and combining partial models fro-selected components. This approach considers specific features and structure of heat supply system and diversified reliability criteria for selected subsystems. Methods for system evaluation of heat supply system reliability depend on number of parameters used for system description. The one-parameter assessment is based on so called stationary readiness coefficient for the whole system. In two-parameter method an additional parameter is added, named as mean failure period or as mean system capacity period. In three-parameter method, the generalized reliability characteristic based on mean heat shortage is added to give more information about the system.

RELIABILITY ANALYSIS FOR A TWO ELEMENT SYSTEM ATTENDED BY TWO REPAIRMEN

Stationary probabilities for the states of a system, the readiness coefficient, and the average productivity between failures with priority maintenance are obtained.

Determination of the failure flux parameter and the coefficient of readiness of the constituent elements of a nuclear reactor

Determination of the failure flux parameter and the coefficient of readiness of the constituent elements of a nuclear reactor

Estimation of equipment reliability for the wet granulation of industrial carbon

With a view to increasing the reliability of work of units for the wet granulating of industrial carbon, operating data concerning failures of the basic complementary equipment of such units--the SGS-40 mixer-granulator, BSK-40 drying drum, and PSR.00.00.000 bucket elevator--were analyzed. This allowed the reliability indices, mean time between failures, mean repari time, and readiness coefficient to be estimated, the basic causes of equipment failures to be revealed, and also measures, for increasing its reliability to be outlined. Analysis of the stoppage of the equipment showed that about 70% of failures depend on operating factors: disturbance of the production schedule, operating regulations, and technical service.

Some aspects of the reliability of drilling equipment

1. Existing criteria for estimating the reliability of mining equipment (time to breakdown, coefficient of operational readiness, etc.) based on the time factor cannot be used to estimate the operational reliability of drill rigs without involving the borehole length, because the latter influences their operational conditions. 2. The reliability of drill rigs must be estimated by means of indices functionally related to the borehole length (the probability of occurrence of reject boreholes and of correctible and uncorrectible breakdowns, and the probable length of breakdown-free drilling). In some cases it is possible to elucidate the physical nature of a breakdown and to determine the suitability of the equipment for particular conditions.

ON THE CREATION OF SECTORAL MACHINERY RECYCLING SYSTEM IN AGROINDUSTRIAL COMPLEX

The necessity of formation of resource-saving ekologiurad-based utilization system of agricultural machinery in agriculture was confirmed by studies conducted in the center FNAC VIM in 2013-2018 years during this period, information was collected about the structure of the charged parts of agricultural machinery (agricultural machinery) going to maintenance of the enterprise with the purpose of recycling. Qualified specialists of repair enterprises were involved in determining the status of parts of the utilized equipment, normative documentation and necessary equipment were used. Terms of operation were determined from the date of purchase until the receipt of the machine to the repair company. The obtained data were subjected to statistical processing in order to determine the effect of the terms of service on the technical condition of these items and determining the number of parts of different groups (in percentage) included in the utilized agricultural machinery, as well as one of the main factors for deciding the feasibility of recycling equipment. The aim of work is justification of alternative ecological oriented intelligent system “Selkhozretsikling” formation for realization of a new strategy of resources use connected with their reuse. The averaged dependences of the change in the coefficient of technical readiness for tractors and combines on their service life are determined. Making an informed decision about the appropriateness of further use the machine (repair or disposal), which is close (or reached) to the limit state depends on the accuracy and timeliness of receiving information about the level of loss of its fitness after a certain service life or operating time. As analysis showed in most farms (52%) the preparation of the components of wastes derived of operation technics allows to use their potential on secondary market. Theoretical works and legislative documents make it possible to carry out the necessary practical measures for the formation of a system for utilization of agricultural equipment.

Determining the readiness coefficient of an equipment with given operation and rest periods

Determining the readiness coefficient of an equipment with given operation and rest periods